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360 renovating/tuning
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shushqa View Drop Down
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Joined: Jun/02/2017
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote shushqa Quote  Post ReplyReply Direct Link To This Post Posted: Mar/28/2023 at 3:38am
About ratio I’m leaning toward 3.73-4.10 something I believe also looking for a good lock and haven’t quite decided between auburn and Detroit locker.

I usually travel short distance, but some(very few)meetings could be up to 450km away.

I’ll try and speak to the mechanic about offsetting and porting, otherwise I know I’ve spoken to John Rosello a while back. Maybe could have a talk about heads with him again.
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WesternRed View Drop Down
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Points: 5796 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Mar/28/2023 at 3:44am
Your European 98 octane (RON) is roughly equivalent to US 93 octane (MON) so probably 9.5:1 is a good compression target, maybe a little more. If you want to run E85, you can add more compression and make more power, but have to make sure that everything the fuel touches is compatible, will also use around 30% more.

If you are going to add boost, then you might not want to go bumping up compression. I’ve got a small block Mopar build in the works and was going to bump the compression up, but looking at the cost of new pistons and maybe also rods to make this work does raise the question of maybe leave the compression alone and add a Chinese eBay turbo instead, might be the cheaper option.
I've finally given up drinking for good...........now I only drink for evil.
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WesternRed View Drop Down
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Points: 5796 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Mar/28/2023 at 3:47am
Originally posted by WesternRed WesternRed wrote:

Your European 98 octane (RON) is roughly equivalent to US 93 octane (MON) so probably 9.5:1 is a good compression target, maybe a little more, I’m running 10:1 with ported iron heads and a Crane hydraulic roller that is not far off your Lunati numbers, somewhere in the 350-400 hp range. If you want to run E85, you can add more compression and make more power, but have to make sure that everything the fuel touches is compatible, will also use around 30% more.

With alloy heads you can shoot for maybe 0.5-1.0 more on the compression than Iron heads.LOL

If you are going to add boost, then you might not want to go bumping up compression. I’ve got a small block Mopar build in the works and was going to bump the compression up, but looking at the cost of new pistons and maybe also rods to make this work does raise the question of maybe leave the compression alone and add a Chinese eBay turbo instead, might be the cheaper option.
I've finally given up drinking for good...........now I only drink for evil.
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Trader View Drop Down
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Points: 6875 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Mar/28/2023 at 8:17am
The E85 vs gasoline are really different builds also.
E85 has less BTU by volume then gasoline and has 27% less energy per gallon.
The volume of E85 to produce more power in the same CID is much higher, though you can run higher compression due to the less energy, higher octane and cooler burn temperature.
Agree with WesternRed, pick your fuel and build around that. 
That 397 stroker build was just about perfect for getting every BTU into useful HP for SCR and displacement/stroke of the motor on paper. Built differently using gasoline with different SCR... , more HP could have been made, but that was not the plan. 
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